Seam-rubbing machine



(No Model.) 2 Sheets-Sheet 1'.

C. S. PIFIELD.

SEAM RUBBING MACHINE. No. 886,241. Patented July 17, 1888.l

WWTNESSES.' VIN T M/W D f MR f/ N. PETERS. Pnolmwgrnphr, washington. D4 t;

(No Model.)

2 Sheets--Sheet 2. G. S. FIFIELD.

SRAM RUBBING MAGHINE.

No. 386,241. Patented July 17, 1888.

WITNESSESI UNITED STATES PATENT GEEICE.

CHARLES S. FIFIELD, OF' REVERE, MASSACHUSETTS.

SEANI-RUBBING MACHINE.

SPECIFICATION forming part of Letters Patent No. 386,241, dated July 1'7, 1888.

Application filed November 14, 1885. Serial No. lSQl, (No model.)

To LZZ whom, it may concern,.-

Be itknown-that I, CHARLES S. FrEIELD, of Revere, in the county of Suffolk and Stat-e of Massachusetts, have invented certain new and useful Improvements in Seam -Rubbers, of which the following is a specification, reference being had to the accompanying drawings, making a part hereof, in which-' Figure lis a lengthwise section in a vertical plane. Fig. 2 is a perspective ofthe presserfoot and guide-fingers. Fig. 3 is a front elevation. Fig. 4 is a rear elevation. Fig. 5 is a sectional detail showing the construction of the support, and Fig. 6 a perspective of the rubber and its holder.

My invention relates to certain improvements in that class of machines known as seamrubbers, which consist, as usually made, of a rotary support, a rotary presserfoot, a vibrating rubbing-tool, and devices for guiding the seam to be rubbed. The rotary support has long been made with two grooves in its periphery, each of which was filled with vulcanized rubber vulcanized in place; and the rst feature of my invention consists in a rotary support for a seam-rnbber made of one central and two side disks and two rings or disks of vulcanized rubber clamped in place between the central and side disks, as fully shown in the drawings, wherein- A represents my rotary support, L being the cent-ral disk, a a2 the side disks, and a a the rubber rings. The clamping-disks a a2 are best held by screws, as shown, and the rubber is preferably in the form of rings, rather than disks, for cheapness. The extra screw-holes are to enable the clamping-disks to be more readily taken off when it is necessary to replace the vulcanized rubber, for after a time the vulcanized rubber will adhere with considerable force to the metal disks a a a2,- but by screwing two of the screws into the eXtra screw-holes the disks a at are readily removed.

My support A is a practical improvement on any other known to me, mainly because of the ease with which the vulcanized rubber, a at, is replaced. Heretofore the supports were sent to the rubber-factory, where the worn-out vulcanized rubber was removed and new compound inserted and vulcanized in place. There are other practical advantages which will be plain to all skilled in the art.

Another feature of my invention consists in the combination of the movable boX b with a spring and stop. The shaft B of the rotary support A is mounted in the box b, which is adapted to be moved toward and away from the rubbingtool D. The box bis mounted in ways, and is forced toward tool D by a spring, b, whose tension is adjusted by screw b2. Stop Zr" is also a screw, so that the relation of the surface of the support A to the surface of the rotary presser-foot E can be nicely adjusted to suit the thickness of the stock which is passed between these surfaces. rlhe box is connected to the treadle-rod b", so that the support A can be readily moved away from the foot E when the stop is to be put in or taken ont of the machine. As the shaft B is long, the motion of the box bD need only be a slight tilt on the center U.

Another part of my invention relates to making the machine self-adjusting for that class of work in which the seam unites two pieces of different thicknesses, and consists in making the support A or the foot E, either or both, movable sidewise as well as rotary. In order to allow the support A to move sidewise, its hub is slotted and the shaft B is also slotted, and apiece ofsheet-stcel, a5, is held in the slot in shaft B by means of the screw bl, the projecting edges of the spline a5 entering the slots in the hub of the support A, thus compelling support A to rot-ate with shaft B, and yet allowing sufificient side play to support A to suit a thicker piece of stock on one side than on the other.

It will be seen that the rotary presser-foot E can also move sidewise slightly, and this is for the same purpose as the like movement of 9c the support A, as will be obvious.

In all other seam-rubbers known to me in which a rotary presser-foot is used bearing on both sides of the seam this foot has consisted of two conical disks, each on its own stud, in order to allow the rubbing-tool D to play between them. rl`he pressure of these two disks upon the work when on the support Acramps the disks on their studs, and I have found that even when made of hardened steel they wear TCO rapidly. Moreover, the cramping makes them run ha-rd and is a serious defect in the l'eed. To remedy these difticulties, I make the two conical disks in one piece with or otherwise fast to a central core or body-that is, I make the rotary presser E in the shapeof acommon spool and cut away the rubbing-tool D to make room for the body of this spool-shaped presser E. This I regard as one of the valuable features of my invention, as it not only reduces the wear andmakes this part of the machine far more durable, but it also makes the feed far more perfect.

As the working-face of the rubbing-tool D wears away so that it must be replaced, I make it with atang, d, to enter a socketin its holder d', and this U-shaped tool, with a tang-projecting from one of its legs, is also new with me.

Another part of my inventionrelates to the manner of mounting the toolholder d', and consists in the combination with it of the spring d* andthe two screws d3 d4, one of which, d, serves to adjust the tension of the spring d, whilefthe other, d, serves to adjust the face of the rubbingtool D with relation to theface of the support A. This compound adjustment is new with me and enables the spring-press ure of the tool to be nicely adjusted for different'kinds of work without danger of the tool rubbing against the support when the work is not between them, for, as will be clear, the machine must commonly he kept in motion during the interval between taking out one piece of work and putting in another.

The guide'ng'ers G are old-in themselves, but heretofore their lower edges, g, have been substantially ata tangent to the periphery of support A, and this made it necessary for the operator to exercise agood deal of care in guiding the seam between the fingers, as (if the operator-was inattentive) the guide-fingers got somewhat crosswise of the seam and then no longer acted as guides, b-ut threw the work av af. This part of my invention consists in guidengers whose lower edges, g, are substantially parallel withthe periphery of sup port A, as shown, and by this feature I do away with all necessity of cnre on the part of the operator in guiding the work, for when the seam is once properly inserted it will be 'automatically guided by my guide-lingers without aid from the operator. j

The feed shown also constitutes a part of my invention. The main shaft H should run about two thousand timesper minntein order to give the rubbing-tool about four thousand motions over the seam, (which I find gives practically the best results;) but obviously the support A, which is also the feed-wheel, must bing, I make a portion, h, of one of the` wormgears (it is immaterialwhich, but in this instance the lower one, L) straight instead of slanting, and this causes the feed to be intermittent-that is, holds the seam still while the rubber is at work upon it, then moves the seam forward a short distance, and again holds it still, and so on.

The operation of my machine will be clear to all skilled in theart without further de- Scription.

What IA claim as my invention is- 1. In a seam-rubber, the support A, composed of the metal disks a a' ai and the rings a3 a, of'. vulcanized rubber or lik-e materiai, clamped in place, substantially asset forth.

2. In a seam-rubbing machine, the movable box b of the shaft B, carrying the support A, in combination with the adjustable spring b and stop b, substantially. as and for the purpose specified. n

3. In a seamrubber, the support' A and presser E, mounted, substantially as described, to move sidewise relatively either to the other, to snit work in which pieces of different thicknesses arejoined by a seam, substantially as described..

4. In a seam-rubbing machine, the spoolshaped presser E, in combination with the U- shaped rubbing-tool D, substantially as described.

5. In a seam-rubbing machine, the seamrubbing tool D, made U shaped and having tang d projecting from one of its legs, substantially as described.

6. In a seamrubber, the tool-holder d', in combination with the spring a' and the adjusting-screws d3 d", substantially as and for the purpose specified.

7. In a seam-rubber, the guide-iingers G, withv their lower edges,g, parallel with the periphery of the support A, substantially as and for the purpose specied.

`8. In a seam-rubber, the combination of main shaft H and feed-shaft B by means of worms h h and `their gears h2 h3, one of the worms having a straight portion, h", as and for the purpose specified.

CHARLES S. FIFIELD.

'VVitnessesz' J. E. MAYNADIER, EDWARD S. BEACH.

IOC 

